Let F(x) = f(f(x)) and G(x)=(F(x))2 . You also know that f(9)=7, f(7)=3, f′(7)=5, f′(9)=7.

Find F′(9)= find Find G′(9)=

The answers are 35 and 210

The answers are right, but I don't remember how I got this right back when I did it weeks ago? Any explanation will be great! thanks